The soil material consists of numerous individual particles,and the shape of these particles directly impacts the macro-and micro-mechanical properties of the soil.Through microscopic observation and considering particle shape effects,a series of discrete element simulations were conducted on tailings particles.Using CT scanning and image processing techniques,the liquefaction characteristics of real particle samples and circular particle samples under three different confining pressures were studied.The results show that tailing silt particles mainly exist in granular and flaky forms,with edge-edge and face-face contacts predominating.Discrete element samples exhibit a"connective band"phenomenon during liquefaction.Under different confining pressures,the dynamic pore pressure in circular particle samples exhibits a"fast-stable"pattern,and the development of dynamic strain shows a"horn-shaped"pattern.In contrast,the dynamic pore pressure in real particle samples changes from"fast-stable"under low confining pressure to"fast-stable-slow"under high confining pressure,and the development of dynamic strain shifts from a"horn-shaped"pattern under low confining pressure to a"trumpet-shaped"pattern under high confining pressure.Additionally,the changes in porosity,coordination number,and energy development differ between the two types of samples.
关键词
颗粒形状/显微观测/尾矿材料/力学性质/离散元模拟
Key words
particle morphology/microscopic observation/tailings material/mechanical property/discrete element simulation
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基金项目
国家自然科学基金资助项目(52174114)
云南省基础研究专项重点项目(202401AS070071)
National Natural Science Foundation of China()
Basic Research Specialized Key Program of Yunnan Province()
维普
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